1. Stir together all dry ingredients in a medium bowl. Brush pork lightly with olive oil, then press spice mixture over all sides of pork. Cover and refrigerate for at least 1 hour and up to 24 hours.

2. Preheat oven to 325°F. Place pork in a 13 X 9-inch baking dish and add 1/2 inch of water to pan. Cover tightly with foil and roast for 3 hours. Remove foil and roast for 1 hour more or until meat shreds easily with a fork, basting occasionally with accumulated drippings.

3. Shred meat with 2 forks, then serve with tortillas and any optional toppers.